No offense but do you have an actual strategy and know how these parts will fit together?
The 2010 LGT has a drive gear on the heads to drive the oil sump for the turbo since it is mounted below the engine, just curious if you know if that will matter or if it's easy to block off because it may cause headaches that would be avoided with 08 STi heads.
I think aftermarket is the only way to go at this point really, it will be quite an ordeal to get the canbus system working and if you are mixing and matching parts that could add other twists.
Ben